The real and effective radiation characteristics of aircraft can increase anti-jamming capability of missile and can be beneficial to make reasonable and effective defensive strategy,which can improve aircraft survivability.Based on radiation characteristics,the radiation models of aircraft nozzle,plume,skin,airframe reflection were established.The model of atmospheric transmission was introduced,and the waveband average transmittance was defined.Through model simulation,the infrared radiation distributions of exhaust system (combining aircraft nozzle with plume) and skin were qualitatively analyzed.The height characteristics of aircraft infrared radiation were analyzed by putting the model of exhaust system and skin into the model of atmospheric transmission simultaneously.Compared the data of simulation with the actual measurement,the reliability of the model is verified.